﻿#pragma once
#include<iostream>
using namespace std;
#define byte unsigned char
#define word unsigned int
int rC[10] = {
	0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,0x1b,0x36
};
int S[16][16] = {
	0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
	0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
	0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
	0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
	0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
	0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
	0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
	0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
	0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
	0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
	0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
	0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
	0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
	0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
	0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
	0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
};
//与S盒对应的逆置换表 
int rS[16][16] = {
	0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
	0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
	0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
	0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
	0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
	0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
	0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
	0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
	0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
	0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
	0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
	0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
	0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
	0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
	0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
	0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
};
//轮密钥加变换 - 将每一列与扩展密钥进行异或
void KeyExpansion(const int key[4][4], int w[11][4][4])
{
	for (int i = 0; i < 4; ++i)
	{
		for (int j = 0; j < 4; j++)
		{
			w[0][i][j] = key[j][i];

		}
	}
	for (int i = 1; i < 11; ++i)
	{
		for (int j = 0; j < 4; ++j)
		{
			int temp[4];
			if (j == 0)
			{
				temp[0] = w[i - 1][3][1];
				temp[1] = w[i - 1][3][2];
				temp[2] = w[i - 1][3][3];
				temp[3] = w[i - 1][3][0];
				for (int k = 0; k < 4; ++k)
				{
					temp[k] = S[temp[k] >> 4][temp[k] & 0x0F];
					if (k == 0)
					{
						temp[k] = temp[k] ^ rC[i - 1];
					}
				}
			}
			else
			{
				temp[0] = w[i][j - 1][0];
				temp[1] = w[i][j - 1][1];
				temp[2] = w[i][j - 1][2];
				temp[3] = w[i][j - 1][3];
			}
			for (int x = 0; x < 4; x++)
			{
				w[i][j][x] = w[i - 1][j][x] ^ temp[x];
			}
		}
	}
}
void SubByte(int in[4][4], int type)
{
	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++) {
			if (type)
				in[i][j] = S[(unsigned char)(in[i][j] >> 4)][(unsigned char)(in[i][j] & 0x0F)];//加密
			else
				in[i][j] = rS[(unsigned char)(in[i][j] >> 4)][(unsigned char)(in[i][j] & 0x0F)];//解密
		}
	}
}
void ShiftRow(int s[4][4], int type) {
	byte temp[4];
	for (int i = 1; i < 4; i++) {
		for (int j = 0; j < 4; j++) {
			if (type)
				temp[j] = s[i][(j + i) % 4];//由于第2行(i=1)左移1位，第3行左移2位，第4行左移,所以左移的数为i
			else
				temp[j] = s[i][(j + (4 - i)) % 4];
		}
		for (int j = 0; j < 4; j++) {
			s[i][j] = temp[j];
		}
	}
}
int mult(int a, int b)
{
	int res = 0;//1110 0000*011
	while (b) {
		if (b % 2) {
			res ^= a;
		}
		if (a >> 7)
			a = ((a << 1) & 0xFE) ^ 0x1B;
		else
			a = a << 1;
		b = b >> 1;
	}
	return res;
}
void MixColumn(int in[4][4], int type)
{
	for (int i = 0; i < 4; i++)
	{
		int t0 = in[0][i];
		int t1 = in[1][i];
		int t2 = in[2][i];
		int t3 = in[3][i];
		if (type == 1)
		{
			in[0][i] = mult(t0, 2) ^ mult(t1, 3) ^ t2 ^ t3;
			in[1][i] = t0 ^ mult(t1, 2) ^ mult(t2, 3) ^ t3;
			in[2][i] = t0 ^ t1 ^ mult(t2, 2) ^ mult(t3, 3);
			in[3][i] = mult(t0, 3) ^ t1 ^ t2 ^ mult(t3, 2);
		}
		else
		{
			in[0][i] = mult(t0, 14) ^ mult(t1, 11) ^ mult(t2, 13) ^ mult(t3, 9);
			in[1][i] = mult(t0, 9) ^ mult(t1, 14) ^ mult(t2, 11) ^ mult(t3, 13);
			in[2][i] = mult(t0, 13) ^ mult(t1, 9) ^ mult(t2, 14) ^ mult(t3, 11);
			in[3][i] = mult(t0, 11) ^ mult(t1, 13) ^ mult(t2, 9) ^ mult(t3, 14);
		}
	}
}
void AddRoundKey(int in[4][4], int key[4][4])
{
	for (int i = 0; i < 4; i++)
	{
		for (int j = 0; j < 4; j++)
		{
			in[i][j] = in[i][j] ^ key[j][i];
		}
	}
}
void AES_Encode(int s[4][4], int key[4][4])
{
	int type = 1;
	int subKey[11][4][4];
	KeyExpansion(key, subKey);
	AddRoundKey(s, subKey[0]);
	for (int i = 1; i <= 10; ++i)
	{
		SubByte(s, type);
		ShiftRow(s, type);
		if (i != 10)MixColumn(s, type);
		AddRoundKey(s, subKey[i]);
	}
}
void AES_Decode(int s[4][4], int key[4][4])
{
	int type = 0;
	int subKey[11][4][4];
	KeyExpansion(key, subKey);
	AddRoundKey(s, subKey[10]);
	for (int i = 9; i >= 0; --i)
	{
		ShiftRow(s, type);
		SubByte(s, type);
		AddRoundKey(s, subKey[i]);
		if (i != 0)MixColumn(s, type);
	}
}
int*** get_input(string s, int key[][4], int choice, int& group) {//s为用户输入字符串,choice为选择，0是加密1是解密,len返回组数
	int c = s.size();

	group = c / 16 + (c % 16 != 0);//不满足128位，所以补零
	int fill = group * 16 - c;
	for (int i = 0; i < fill; i++)s += unsigned char(0);//s存储补0后的信息
	int msg[4][4] = { 0 };
	int txt[4][4] = { 0 };
	int vec[4][4] = { 0 };
	int*** res = new int** [group];
	for (int i = 0; i < 4; i++) {//开结果空间
		res[i] = new int* [4];
		for (int j = 0; j < 4; j++) {
			res[i][j] = new int[4];
		}
	}

	int idx = 0;
	for (int p = 0; p < group; p++) {
		for (int i = 0; i < 4; i++)//获取明文分组
			for (int j = 0; j < 4; j++)
				if (choice) {
					txt[j][i] = s[idx++] & 0xFF;//保存本组密文
					vec[j][i] = txt[j][i];
				}
				else {
					txt[j][i] = ((char)s[idx++] ^ (char)vec[j][i]) & 0xFF;//加密与上一组进行异或
				}


		if (choice)AES_Decode(txt, key);
		else AES_Encode(txt, key);
		for (int i = 0; i < 4; i++)
			for (int j = 0; j < 4; j++) {
				if (choice) {//txt是解密完的，需要和向量进行异或
					//res[p][j][i] = txt[i][j] ^ vec[i][j];
					res[p][j][i] = (txt[i][j] ^ msg[i][j]) & 0xFF;
					msg[i][j] = vec[i][j];
				}
				else {
					vec[i][j] = res[p][j][i] = txt[i][j];
				}
			}
	}
	/*cout << endl << "密文:";
	for (int p = 0; p < group; p++) {
		for (int i = 0; i < 4; i++)
		{
			for (int j = 0; j < 4; j++)
			{
				cout << "0x";
				if (res[p][i][j] < 16)
					cout << "0";
				cout << (hex) << (int)res[p][i][j] << " ";
			}
		}
	}*/
	return res;
}
//int main() {
	//cout << "明文（16进制）：0001, 0001, 01a1, 98af, da78, 1734, 8615, 3566" << endl << "密钥（16进制）：00012001710198aeda79171460153594" << endl << "密文（16进制）：6cdd, 596b, 8f56, 42cb, d23b, 4798, 1a65, 422a" << endl;
	//cout << "明文（16进制）：3243, f6a8, 885a, 308d, 3131, 98a2, e037, 0734" << endl << "密钥（16进制）：2b7e, 1516, 28ae, d2a6, abf7, 1588, 09cf, 4f3c" << endl << "密文（16进制）：3925, 841d, 02dc, 09fb, dc11, 8597, 196a, 0b32" << endl;
	//cout << endl << endl;
	////00 01 00 01 01 a1 98 af da 78 17 34 86 15 35 66
	////00 01 20 01 71 01 98 ae da 79 17 14 60 15 35 94
	////6c dd 59 6b 8f 56 42 cb d2 3b 47 98 1a 65 42 2a
	//while (1) {
	//	cout << "选择	0--->AES加密	1--->AES解密	2--->退出" << endl;
	//	cout << "请输入:";
	//	int choice;
	//	cin >> choice;
	//	int txt[4][4];
	//	int key[4][4];
	//	if (choice == 0)cout << "【加密】请输入明文(16进制):";
	//	else if (choice == 1)cout << "【解密】请输入密文(16进制):";
	//	else break;
	//	for (int i = 0; i < 4; i++)
	//		for (int j = 0; j < 4; j++)
	//			cin >> (hex) >> txt[j][i];

	//	if (choice == 0)cout << "【加密】请输入密钥(16进制):";
	//	else cout << "【解密】请输入密钥(16进制):";
	//	for (int i = 0; i < 4; i++)
	//		for (int j = 0; j < 4; j++)
	//			cin >> (hex) >> key[j][i];

	//	int cpy_txt[4][4];
	//	memcpy(cpy_txt, txt, sizeof(txt));
	//	int cpy_key[4][4];
	//	memcpy(cpy_key, key, sizeof(key));
	//	if (choice == 0)cout << "明文:";
	//	else cout << "密文:";
	//	for (int i = 0; i < 4; i++)
	//	{
	//		for (int j = 0; j < 4; j++)
	//		{
	//			cout << "0x";
	//			if (txt[j][i] < 16)
	//				cout << "0";
	//			cout << (hex) << (int)txt[j][i] << " ";
	//		}
	//	}
	//	cout << endl;
	//	cout << "密钥:";
	//	for (int i = 0; i < 4; i++)
	//	{
	//		for (int j = 0; j < 4; j++)
	//		{
	//			cout << "0x";
	//			if (key[j][i] < 16)
	//				cout << "0";
	//			cout << (hex) << (int)key[j][i] << " ";
	//		}
	//	}

	//	if (choice == 0) Encode(txt, key);
	//	else Decode(txt, key);


//	return 0;
//}
